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Modality shares its root with the word mode, meaning the way in which something happens or is experienced. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood. In logic, modality has to do with whether a proposition is necessary, possible, or impossible.
1. modal-an auxiliary verb (such as `can' or `will') that is used to express modality. modal auxiliary, modal auxiliary verb, modal verb. auxiliary verb-a verb that combines with another verb in a verb phrase to help form tense, mood, voice, or condition of the verb it combines with.